/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */
package wx.xml.xalan.xpath.functions;

import org.xml.sax.ContentHandler;

import wx.xml.xalan.xml.dtm.DTM;
import wx.xml.xalan.xml.utils.XMLString;
import wx.xml.xalan.xpath.XPathContext;
import wx.xml.xalan.xpath.objects.XObject;
import wx.xml.xalan.xpath.objects.XString;

/**
 * Execute the normalize-space() function.
 *
 * @xsl.usage advanced
 */
public class FuncNormalizeSpace extends FunctionDef1Arg {
    static final long serialVersionUID = -3377956872032190880L;

    /**
     * Execute the function.  The function must return
     * a valid object.
     *
     * @param xctxt The current execution context.
     * @return A valid XObject.
     * @throws javax.xml.transform.TransformerException
     */
    public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
        XMLString s1 = getArg0AsString(xctxt);

        return (XString) s1.fixWhiteSpace(true, true, false);
    }

    /**
     * Execute an expression in the XPath runtime context, and return the
     * result of the expression.
     *
     * @param xctxt The XPath runtime context.
     * @return The result of the expression in the form of a <code>XObject</code>.
     * @throws javax.xml.transform.TransformerException if a runtime exception
     *                                                  occurs.
     */
    public void executeCharsToContentHandler(XPathContext xctxt,
                                             ContentHandler handler)
        throws javax.xml.transform.TransformerException,
        org.xml.sax.SAXException {
        if (Arg0IsNodesetExpr()) {
            int node = getArg0AsNode(xctxt);
            if (DTM.NULL != node) {
                DTM dtm = xctxt.getDTM(node);
                dtm.dispatchCharactersEvents(node, handler, true);
            }
        } else {
            XObject obj = execute(xctxt);
            obj.dispatchCharactersEvents(handler);
        }
    }

}
